Methods, systems, and devices for wireless communication are described. A wireless device may identify an aggregation capability to communicate in parallel over a plurality of wireless links. The wireless device may in some cases broadcast this aggregation capability (e.g., periodically). Additionally or alternatively, the wireless device may transmit the aggregation capability in response to a request received from another wireless device. In some cases, the first wireless device may transmit a request to a second wireless device inquiring about aggregation capabilities of the second wireless device. The second wireless device may respond with its aggregation capabilities (e.g., or may broadcast its aggregation capabilities independently of receiving the response). The wireless devices may establish a multi-link session based at least in part on the indicated aggregation capabilities.

A circuit arrangement capable of adjusting signal parameters of a plurality of signals that is transmitted between one or more terminals and one or more antennas is provided. The circuit arrangement is configured to separate a common signal path for the plurality of signals into a plurality of individual signal paths, wherein two or more signal paths of the plurality of signal paths are configured to carry different single signals. A signal adjusting section is configured to independently adjusting one or more signal parameters for two or more single signals.

An objective of the present invention is to provide an optical communication system and an optical communication method that can reduce even a delay generated in processing of obtaining a transfer function for correcting distortion in digital coherent transmission. In the optical communication system according to the present invention, pilot data for estimating a transfer function for a transmission channel is transmitted through a transmission channel with a short transmission delay time, a transfer function of the transmission channel is estimated before receiving transmission data, and the transfer function is applied to other transmission channels.

A circuit includes a transmitter, a transmission channel communicatively coupled with the transmitter, and a receiver communicatively coupled with the transmission channel. The circuit further includes a combiner on a transmitter-side of the transmission channel, a decoupler on a receiver-side of the transmission channel, and a channel loss compensation circuit communicatively coupled between the transmitter and the receiver. The combiner is coupled between the transmitter and the transmission channel. The decoupler is coupled between the receiver and the transmission channel.

A transmitter apparatus that performs beamforming with phase correction uses power detectors present between power amplifiers (PAs) and antennas are used to measure power amplitudes on at least two transmission paths. The sum and difference of these amplitudes are then evaluated to determine a phase difference therebetween. A phase of one signal contributing to the sum and difference may be modified until the sum and difference are the same. Based on an amount of phase modification, a correction signal may be sent to a beamforming circuit to provide phase correction during beamforming.

Described are broadband active coupling circuits and methods. A broadband active coupling circuit includes a high-pass circuit configured to provide a high frequency response for a broadband signal and a low-pass circuit connected in parallel with the high-pass circuit. The low-pass circuit is configured to provide a low frequency response for the broadband signal, where the low-pass circuit includes an active circuit configured to minimally impact the high frequency response provided by the high-pass circuit.

A simultaneous bi-directional (SBD) transceiver includes a main transmit driver, a replica transmit driver, and a series-series-bridged (SSB) tri-impedance network. A pre-driver stage includes parallel delay paths for the main transmit driver and the replica transmit driver, enabling the delay for signals received by the main transmit driver and the replica transmit driver to be independently configured.

A CMOS chip includes a signal converting circuit configured to convert a baseband signal and an RF signal, a plurality of ports through which the RF signal is transmitted or received, the plurality of ports being respectively included in a first transmission path, a second transmission path, and a reception path, and a plurality of matching networks connected to the signal converting circuit, the plurality of matching networks being respectively connected to the plurality of ports, a first matching network among the plurality of matching networks including an external matching network, and the external matching network being configured to perform an impedance matching of a compound semiconductor device.

A system may include a digital front end (DFE). The DFE may be configured to generate a command signal. The system may also include a sweeper. The sweeper may be configured to generate an intermediate in-phase signal, an intermediate quadrature signal, and a LO signal based on the command signal. In addition, the system may include a mixer. The mixer may be configured to generate a mixed in-phase signal based on the intermediate in-phase signal and the LO signal. The mixer may also be configured to generate a mixed quadrature signal based on the intermediate quadrature signal and the LO signal. Further, the system may include an amplifier. The amplifier may be configured to generate an in-phase signal based on the mixed in-phase signal and an amplification setting. The amplifier may also be configured to generate a quadrature signal based on the mixed quadrature signal and the amplification setting.

Disclosed herein is a new type of fully-connected, hybrid beamforming transceiver architecture. The transceiver described herein is bi-directional and can be configured as a transmit beamformer or a receive beamformer. A method and apparatus are described that allows the beamformer to operate in “carrier aggregated” mode, where communication channels in multiple disparate frequency bands can be simultaneously accessed.